Events.

[Alestorm]

I understand about license etc. but if garo won't come back anymore that doesn't mean items can't right ? They can just add them to golden saucer or create specific vendor. I dunno it's just sad that we (players) can't make use of those anymore (glam purpose for example)

Likely due to the terms in the license agreement the items will likely not be made obtainable without renegotiation. So they can't put them in the GS; but players who got the items can still use them and if they earned the achievements can still get them from the calamity salvager if they throw them away.